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<div class="title">FWMath.h</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode:c++ -*- ********************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> * file:        FWMath.h</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * author:      Christian Frank</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * copyright:   (C) 2004 Telecommunication Networks Group (TKN) at</span>
<a name="l00007"></a>00007 <span class="comment"> *              Technische Universitaet Berlin, Germany.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> *              This program is free software; you can redistribute it</span>
<a name="l00010"></a>00010 <span class="comment"> *              and/or modify it under the terms of the GNU General Public</span>
<a name="l00011"></a>00011 <span class="comment"> *              License as published by the Free Software Foundation; either</span>
<a name="l00012"></a>00012 <span class="comment"> *              version 2 of the License, or (at your option) any later</span>
<a name="l00013"></a>00013 <span class="comment"> *              version.</span>
<a name="l00014"></a>00014 <span class="comment"> *              For further information see file COPYING</span>
<a name="l00015"></a>00015 <span class="comment"> *              in the top level directory</span>
<a name="l00016"></a>00016 <span class="comment"> ***************************************************************************</span>
<a name="l00017"></a>00017 <span class="comment"> * part of:     framework implementation developed by tkn</span>
<a name="l00018"></a>00018 <span class="comment"> **************************************************************************/</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef FWMATH_H</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define FWMATH_H</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 <span class="comment">// Support functions for mathematical operations</span>
<a name="l00025"></a>00025 <span class="comment">//</span>
<a name="l00026"></a>00026 
<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;math.h&gt;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &quot;INETDefs.h&quot;</span>
<a name="l00029"></a>00029 
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="comment">/* windows math.h doesn&#39;t define the PI variable so we have to do it by hand*/</span>
<a name="l00032"></a>00032 <span class="preprocessor">#ifndef M_PI</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#define M_PI 3.14159265358979323846</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span>
<a name="l00036"></a>00036 <span class="comment">/* windows math.h doesn&#39;t define sqrt(2) so we have to do it by hand. */</span>
<a name="l00037"></a>00037 <span class="preprocessor">#ifndef M_SQRT2</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#define M_SQRT2 1.41421356237309504880</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="comment">/* Constant for comparing doubles. Two doubles at most epsilon apart</span>
<a name="l00042"></a>00042 <span class="comment">   are declared equal.*/</span>
<a name="l00043"></a>00043 <span class="preprocessor">#ifndef EPSILON</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#define EPSILON 0.001</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00047"></a>00047 
<a name="l00057"></a><a class="code" href="a00095.html">00057</a> <span class="keyword">class </span>INET_API <a class="code" href="a00095.html" title="Support functions for mathematical operations.">FWMath</a> {
<a name="l00058"></a>00058 
<a name="l00059"></a>00059  <span class="keyword">public</span>:
<a name="l00060"></a>00060 
<a name="l00064"></a><a class="code" href="a00095.html#a2867eea5a97b7685de513a989046f699">00064</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#a2867eea5a97b7685de513a989046f699">mod</a>(<span class="keywordtype">double</span> dividend, <span class="keywordtype">double</span> divisor) {
<a name="l00065"></a>00065       <span class="keywordtype">double</span> i;
<a name="l00066"></a>00066       <span class="keywordflow">return</span> modf(dividend/divisor, &amp;i)*divisor;
<a name="l00067"></a>00067   }
<a name="l00068"></a>00068 
<a name="l00072"></a><a class="code" href="a00095.html#a76f6d077fea756cc254c9405d0b51708">00072</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#a76f6d077fea756cc254c9405d0b51708">div</a>(<span class="keywordtype">double</span> dividend, <span class="keywordtype">double</span> divisor) {
<a name="l00073"></a>00073       <span class="keywordtype">double</span> i;
<a name="l00074"></a>00074       modf(dividend/divisor, &amp;i);
<a name="l00075"></a>00075       <span class="keywordflow">return</span> i;
<a name="l00076"></a>00076   }
<a name="l00077"></a>00077 
<a name="l00082"></a><a class="code" href="a00095.html#adfee479fcdbaba84bd4cfa57cdacf97e">00082</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#adfee479fcdbaba84bd4cfa57cdacf97e">modulo</a>(<span class="keywordtype">double</span> a, <span class="keywordtype">double</span> n) { <span class="keywordflow">return</span> (a - n * floor(a/n)); }
<a name="l00083"></a>00083 
<a name="l00089"></a><a class="code" href="a00095.html#a38d2500887b49de2a2b5f8610f7ba6d1">00089</a>   <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="a00095.html#a38d2500887b49de2a2b5f8610f7ba6d1">close</a>(<span class="keywordtype">double</span> one, <span class="keywordtype">double</span> two) { <span class="keywordflow">return</span> fabs(one-two)&lt;EPSILON; }
<a name="l00090"></a>00090 
<a name="l00095"></a><a class="code" href="a00095.html#a4d2b3271455f9f914bd85c0e22064c09">00095</a>   <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="a00095.html#a4d2b3271455f9f914bd85c0e22064c09">stepfunction</a>(<span class="keywordtype">double</span> i) { <span class="keywordflow">return</span> (i&gt;EPSILON) ? 1 : close(i, 0) ? 0 :-1; };
<a name="l00096"></a>00096 
<a name="l00100"></a><a class="code" href="a00095.html#aa9f55c74f3cb5eb99d5ff3d00ca3d281">00100</a>   <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="a00095.html#aa9f55c74f3cb5eb99d5ff3d00ca3d281">sign</a>(<span class="keywordtype">double</span> i) { <span class="keywordflow">return</span> (i&gt;=0)? 1 : -1; };
<a name="l00101"></a>00101 
<a name="l00105"></a><a class="code" href="a00095.html#ad5b2d4a46bf7af77e9cc0070b6a82c18">00105</a>   <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="a00095.html#ad5b2d4a46bf7af77e9cc0070b6a82c18">round</a>(<span class="keywordtype">double</span> d) { <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)(ceil(d-0.5)); }
<a name="l00106"></a>00106 
<a name="l00110"></a><a class="code" href="a00095.html#adb95c6d5b092b752dba10eddac28055d">00110</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#adb95c6d5b092b752dba10eddac28055d">floorToZero</a>(<span class="keywordtype">double</span> d) { <span class="keywordflow">return</span> (d &gt;= 0.0)? floor(d) : ceil(d); }
<a name="l00111"></a>00111 
<a name="l00115"></a><a class="code" href="a00095.html#a7fd5acab90d26f509178dbda7935adcf">00115</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#a7fd5acab90d26f509178dbda7935adcf">max</a>(<span class="keywordtype">double</span> a, <span class="keywordtype">double</span> b) { <span class="keywordflow">return</span> (a&lt;b)? b : a; }
<a name="l00116"></a>00116 
<a name="l00120"></a><a class="code" href="a00095.html#af308407856d9835b103f2421e373ee28">00120</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#af308407856d9835b103f2421e373ee28">dBm2mW</a>(<span class="keywordtype">double</span> dBm) { <span class="keywordflow">return</span> pow(10.0, dBm/10.0); }
<a name="l00121"></a>00121 
<a name="l00125"></a><a class="code" href="a00095.html#af1390153a78142efb6af6225034f954f">00125</a>   <span class="keyword">static</span> <span class="keywordtype">double</span> <a class="code" href="a00095.html#af1390153a78142efb6af6225034f954f">mW2dBm</a>(<span class="keywordtype">double</span> mW) { <span class="keywordflow">return</span> (10 * log10(mW)); }
<a name="l00126"></a>00126 };
<a name="l00127"></a>00127 
<a name="l00128"></a>00128 <span class="preprocessor">#endif</span>
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